/Engine/Source/Runtime/Landscape/Classes/LandscapeComponent.h
Helper function for UpdateMaterialInstance to get Material without set parameters
[UMaterialInstanceConstant](API\Runtime\Engine\Materials\UMaterialInstanceConstant) * GetCombinationMaterial ( [FMaterialUpdateContext](API\Runtime\Engine\FMaterialUpdateContext) * InMaterialUpdateContext, const [TArray](API\Runtime\Core\Containers\TArray)< [FWeightmapLayerAllocationInfo](API\Runtime\Landscape\FWeightmapLayerAllocationInfo) > & Allocations, int8 InLODIndex, bool bMobile ) const